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Operational Guidelines for Intensified National Sari Surveillance

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Operational Guidelines for Intensified National Sari Surveillance OPERATIONAL GUIDELINES FOR INTENSIFIED NATIONAL SARI SURVEILLANCE IHR, Alert and Response, and Epidemic Diseases Project Pan American Health Organization Washington, D. C. January 2011 CONTENTS Introduction_______________________________________________________________3 1. Overview ___________________________________________________________5 1.1. Background ________________________________________________________5 1.2. The International Health Regulations ____________________________________5 1.3. The Epidemiology of Influenza _________________________________________6 1.4. Clinical Description of Influenza__________________________________________10 1.5. Influenza and SARI surveillance _________________________________________11 1.6. Influenza Surveillance _________________________________________________13 2. Intensified National Surveillance of SARI________________________________15 2.1. Introduction _________________________________________________________15 2.2. Specific surveillance objectives________________________________________15 2.3. Purpose of surveillance______________________________________________16 2.4. Type of surveillance ________________________________________________16 2.5. Area of surveillance_________________________________________________16 2.6. Target population for surveillance ______________________________________16 2.7. Seasonality _________________________________________________________16 2.8. Data management__________________________________________________16 2.8.1. Data Collection Forms _______________________________________________17 2.8.2. Data collection steps ______________________________________________17 2.8.3. Data Analysis ___________________________________________________20 2.9. Organizing the Intensified National Surveillance System ______________________29 2.10. Information Flow ____________________________________________________31 Bibliography _____________________________________________________________32 ANNEX I - Collecting, Storing and Transporting Specimens of Respiratory Secretions for Virus Identification ______________________________________________________________37 October 2010 version 1 ANNEX II – Process Evaluation and Analysis of Surveillance Data ___________________51 ANNEX III – Infection Control _________________________________________________56 ANNEX IV – Data Collection Forms ____________________________________________62 ANNEX V – INFLU Data Analysis Application _____________ Error! Bookmark not defined. October 2010 version 2 Introduction Emerging respiratory infectious diseases pose a substantial risk for humans due to their extremely high potential to spread from person-to-person. These diseases can produce high morbidity and mortality. There have been several incidents of emerging respiratory infectious diseases in the last hundred years, including the influenza pandemic of 1918 known as the “Spanish flu”, the 1957 “Asian flu” pandemic, the 1968 “Hong Kong flu” pandemic, the 2003 Severe Acute Respiratory Syndrome (SARS) pandemic, and the influenza A (H1N1) pandemic of April 2009. All of these events demonstrate the importance of having a respiratory disease surveillance system that can detect new viruses rapidly and provide information to assess impact on the population and having operational preparedness plans. The International Health Regulations [IHR (2005)] in effect since 15 June 2007 require all Member States to strengthen their surveillance and response capacities for events with major public health implications. Under the IHR (2005), PAHO/WHO is to be notified immediately of all cases of the following diseases: smallpox, poliomyelitis (due to wild poliovirus), SARS, and human influenza due to new virus subtypes. To strengthen basic surveillance and response capacities and integrate the epidemiological surveillance of influenza with laboratory surveillance into one system, the Pan American Health Organization (PAHO), in collaboration with the United States Centers for Disease Prevention and Control (CDC), developed a Generic Protocol for Influenza Surveillance, along with two operational guides designed primarily for local health teams in the PAHO Member States. The first operational guide was designed to help prepare health care facilities for unusual or unexpected cases or clusters of severe acute respiratory infection (SARI), while the second was designed to systematize approaches to the implementation of sentinel surveillance of influenza-like illness (ILI) and SARI. One important lesson learned from the 2009 influenza pandemic was the importance of obtaining information about severe cases. To that end, resources should be focused on expanding SARI surveillance. The purpose of this document is to provide a tool to support countries in implementing intensified SARI surveillance. October 2010 version 3 October 2010 version 4 1. Overview 1.1. Background On 24 April 2009, the World Health Organization (WHO) notified Member States of human cases of swine influenza A (H1N1) in Mexico and the United States. The following day, pursuant to the International Health Regulations (IHR-2005) the event was declared to be a public health emergency of international importance. On 11 June 2009, a WHO statement declared phase six of preparations for the pandemic to be implemented worldwide. In other words, human infection caused by the 2009 pandemic influenza virus A (H1N1) 2009 had spread at the community level on more than two continents. As of 10 August, 2010, when the pandemic was declared over by WHO, more than 213 countries, representing all the continents, had reported confirmed cases of infection caused by the new virus, including 18,449 deaths, 8,557 of which were in the Region of the Americas. 1.2. The International Health Regulations The International Health Regulations (IHR) are a set of binding legal instruments adopted by the Member States of the World Health Organization (WHO) to contain the spread of disease. The most recent revision of the regulations (2005) is an updated version of the 1969 regulations, which specified only four notifiable diseases – cholera, plague, yellow fever and smallpox (now eradicated). The 1969 version set forth general border control provisions, as well as relatively passive notification and monitoring measures. The new version – an unprecedented international public health agreement – provides for containing health emergencies at their local points of origin, rather than limiting action to national borders. The IHR (2005) have been in effect since 15 June 2007. It covers all diseases and health events that can have serious public health impact and that have the potential for international propogation. These diseases can range from emerging infections such as SARS and new human influenza viruses to chemical spills or leaks and nuclear accidents. The IHR specify a series of procedures for the management of such events, as well as basic requirements for national surveillance and response. These core competencies include the capacities to detect, investigate, confirm, notify, and take action on diseases or health events that could constitute public health emergencies of international significance. October 2010 version 5 Under the IHR (2005), PAHO/WHO should be notified immediately of all cases of the following diseases: smallpox, poliomyelitis (due to wild poliovirus), SARS, and human influenza caused by new virus subtypes. Annex II of the IHR (2005) refers to the surveillance, exchange of information, consultation, confirmation, and public health response to any new influenza virus subtype with pandemic potential. These notifications are to include assessments of human risk from influenzas occurring in avian populations. Detecting such outbreaks is responsibility of the World Organization for Animal Health (OIE). 1.3. The Epidemiology of Influenza The influenza virus The influenza virus is an RNA virus of the orthomomyxoviridae family. There are three types of the virus capable of causing disease in humans which have been identified—A, B, and C. However, only the A viruses, which are highly mutatable, have caused pandemics. The B viruses have caused sporadic outbreaks with high mortality in older adults, while the C viruses are usually associated with mild disease. Subtypes of the influenza A viruses also have designations, which are based on the hemagglutinin and neuraminidase proteins present on their surface (Figure 1). Sixteen hemagglutinin subtypes and nine neuramidase subtypes have been identified. At present, the influenza A virus subtypes pandemic (H1N1) 2009 and H3N2 in circulation are responsible for seasonal epidemics (Table 1). The H5, H7 and H9 viruses rarely produce disease in humans. Figure 1 Characteristics of the influenza A virus October 2010 version 6 Lipoprotein shell with glycoprotein surface projections in the form of: • Hemagglutinin (H) 16 antigens • Neuraminidase (N) 9 antigens Table 1 Influenza A viruses responsible for the last four pandemics Virus type/subtype Pandemic Year A/H1N1 Spanish Flu 1918 A/H2N2 Asian Flu 1957 A/H3N2 Hong Kong Flu 1968 A/H1N1 Influenza H1N1 2009 Influenza A viruses have two principal features that give them major pandemic potential: • antigenic variability • an extensive animal reservoir, especially wild aquatic birds, which are a natural reservoir of all the known influenza subtypes The phenomenon of influenza A epidemics and pandemics is due to the frequency with which the genetic composition of influenza A viruses changes. Genetic changes, known as “antigenic
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